One idea that I've suggested the Lindens might employ some day is to create a "make local primitive" feature, whereby a repeated structural element such as a pillar, or windowframe might be designated as being a single object, then rather than downloading a half dozen different sets of coordinates, rotations and sizes, only two vectors, rotation and location would be sent.
If you used 5 prims for a window, but had 20 windows, you'd only have to send the equivilent data of 5 prims for the original one, and then 19 more prims for each copy of the first "local prim". The other way would require a transfer of 100 prims for the entire set of windows. Obviously, it would be a further extention of the already fairly steep learning curve of the SL building engine, but for those of us who knew about it, it'd be a handy way to both cut down on the transfer time of our builds, as well as a way to save prims. I would imagine that the prim cost of heavily repeated objects might go down as more of them were rezzed, in an effort to acknowledge both the decreased bandwidth consumption and the reality of rendering that many more polygons.
As for trees, yes, in fact they
are a single prim. Remeber that SL's "prims" aren't true primitives such as one might expect to find in 3D Studio or Maya, rather, they're fairly complex,
predesigned models that are able to have certain parameters passed to them so as to appear differently.
Consideration of the number of prims available to us through the "Building Block Type" dropdown list in the Edit window, (Box, Cylinder, Prism, Sphere, Torus and Tube) as well as the Grass and Tree objects, and possibly -- I have to admit, I'm speculating here, in no small part to some
wishful thinking -- the avatar model leaves me with a count of 8 or 9. I further propose that the prim signal in the SL communications protocol may, in fact be not just a single byte, but a 1-digit
integer, giving us a maximum of 10 objects with which to build.
This is the sort of speculation that either results in messages from the Lindens along the lines of, "Catherine, you've... never written a network app before, have you?" or "Did you break into the CVS server!?" In other words, I have no idea what I'm talking about, but I could be lucky here. It's not important anyway. (*pats her homemade, reverse-engineered SL client* "Soon, my pet, soon!"

No, I have no idea where I was going with that tangent either. Onwards!
So yeah, fancy stuff, Kris. I like the maroon coloured thing. If only we had a way to change all that stuff in the Object tab of the editor window via LSL. I'd love to see those animate and grow on their own.
And finally, to Hawk:
That's a clip from a Japanese TV commercial for a large construction company,
Anabuki Construction . I believe it's about five years old or so. As part of an effort to not seem... you know,
evil and all, (they
are in the same business as Halliburton, mind) they commissioned these commercials depicting large, anthropomorphic woodland creatures not being crushed under the wheels of progress, so to speak.
Because the company's name, "Anabuki", sounds similar to "Anabu-kin-chan", Little Red Riding Hood in Japanese, they chose her as the mascot of the ad campaign. You know, it's one of those newfangled "play on words" things?

Anyway, the deal with the gigantic furry testicles in Buck's forum avatar is this: that's not a raccoon. They don't have those in Japan. That's a tanuki, (Remember the Tanooki Suit in Super Mario Bros. 3?) commonly (but erroneously) called a "raccoon-dog" in English. (Just as westerners tend to say "panda bear" rather than "panda" in colloquial speech, a sort of attempt to classify species by behavior and appearence rather than genetic heritage.) Though it
is a member of the canine family, the tanuki only
looks like a raccoon. Parallel evolution in action!
In traditional Japanese folklore, the shape-changing Tanuki plays a role similar to that of Coyote, the trickster spirit common to many Southwestern American Native cultures. (Some anthropologists and cultural historians have suggested a link between the two, but I suspect it's another case of parallel development.)
And in folklore, a Tanuki gets his powers from his testicles and scrotum. Seriously. So that's why they're depicted as being monsterously large in the commercial. And the reason for having Little Red Riding Hood come face-to-ahh, "face" with said monsterous appendages, then giving us the reaction shot of said little girl looking bewildered and somewhat frightened is because the Japanese media is completely insane
For more on Tanukis, Anabuki Construction and Anabu-kin-chan, please visit your local library--er, no, visit these sites:
http://fursuit.timduru.org/dirlist/FursuitVideo/Commercials_Ads/anabukin/http://www.stinky.com/anabu/index.htmlhttp://images.google.com/images?q=tanuki&hl=en&lr=&ie=UTF-8&oe=utf-8&safe=off&sa=N&tab=wihttp://www.anabuki.co.jp/anabukin-chan/http://www.nausicaa.net/miyazaki/pompoko/faq.html#title